"He was completely cordial," Judy Charny said, recalling a phone message she received from Christopher last week, after sending him a letter that his wife would be filing for divorce and hoped to settle things amicably.

"I asked him where he wanted me to send the complaint and he said I could just send it to the home," Charny said.

Man, Woman Killed in Doctor's Office

Charny filed the divorce papers with the court last Thursday, but doesn't think Christopher Liggio ever received a copy. She mailed them out to him on Tuesday, the very day he walked into his wife's office during the lunch hour and confronted her.

Dr. Liggio's workers told police that the couple began arguing and then they heard the doctor plead, "No, no, no," before Christopher Liggio opened fire.

In the divorce complaint, Michelle Liggio cited Irreconcilable Differences as the reason for the split. She was asking for joint custody of the couple's two teenage boys, child support and alimony. Dr. Liggio was also asking to remain in the home while her husband found another place to live.

At least two studies show that in murder-suicides involving couples, 9 out of 10 times the man is the perpetrator, according to the Violence Policy Center's most recent research on murder-suicide in the United States.